Apparently, American environmentalists have put huge areas of Canada off-limits to development as de facto trade barriers that enforce a U.S. monopoly on our exports, while at the same time as they want to drop our exports to the U.S. to zero. Or something.
This supposed scandal has been hiding in plain sight for almost a decade, and almost none of the key facts holds up to scrutiny. A veritable cottage industry has grown up promoting one of the most politically convenient conspiracy theories in recent memory.